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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9818) NPE in HFileBlock#AbstractFSReader#readAtOffset
Date Tue, 05 Nov 2013 23:50:19 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13814417#comment-13814417
] 

Sergey Shelukhin commented on HBASE-9818:
-----------------------------------------

logging lgtm. What does it say when it fails

> NPE in HFileBlock#AbstractFSReader#readAtOffset
> -----------------------------------------------
>
>                 Key: HBASE-9818
>                 URL: https://issues.apache.org/jira/browse/HBASE-9818
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Jimmy Xiang
>            Assignee: Ted Yu
>         Attachments: 9818-v2.txt, 9818-v3.txt
>
>
> HFileBlock#istream seems to be null.  I was wondering should we hide FSDataInputStreamWrapper#useHBaseChecksum.
> By the way, this happened when online schema change is enabled (encoding)
> {noformat}
> 2013-10-22 10:58:43,321 ERROR [RpcServer.handler=28,port=36020] regionserver.HRegionServer:
> java.lang.NullPointerException
>         at org.apache.hadoop.hbase.io.hfile.HFileBlock$AbstractFSReader.readAtOffset(HFileBlock.java:1200)
>         at org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderV2.readBlockDataInternal(HFileBlock.java:1436)
>         at org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderV2.readBlockData(HFileBlock.java:1318)
>         at org.apache.hadoop.hbase.io.hfile.HFileReaderV2.readBlock(HFileReaderV2.java:359)
>         at org.apache.hadoop.hbase.io.hfile.HFileBlockIndex$BlockIndexReader.loadDataBlockWithScanInfo(HFileBlockIndex.java:254)
>         at org.apache.hadoop.hbase.io.hfile.HFileReaderV2$AbstractScannerV2.seekTo(HFileReaderV2.java:503)
>         at org.apache.hadoop.hbase.io.hfile.HFileReaderV2$AbstractScannerV2.reseekTo(HFileReaderV2.java:553)
>         at org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseekAtOrAfter(StoreFileScanner.java:245)
>         at org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseek(StoreFileScanner.java:166)
>         at org.apache.hadoop.hbase.regionserver.StoreFileScanner.enforceSeek(StoreFileScanner.java:361)
>         at org.apache.hadoop.hbase.regionserver.KeyValueHeap.pollRealKV(KeyValueHeap.java:336)
>         at org.apache.hadoop.hbase.regionserver.KeyValueHeap.generalizedSeek(KeyValueHeap.java:293)
>         at org.apache.hadoop.hbase.regionserver.KeyValueHeap.requestSeek(KeyValueHeap.java:258)
>         at org.apache.hadoop.hbase.regionserver.StoreScanner.reseek(StoreScanner.java:603)
>         at org.apache.hadoop.hbase.regionserver.StoreScanner.next(StoreScanner.java:476)
>         at org.apache.hadoop.hbase.regionserver.KeyValueHeap.next(KeyValueHeap.java:129)
>         at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.populateResult(HRegion.java:3546)
>         at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextInternal(HRegion.java:3616)
>         at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:3494)
>         at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:3485)
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.scan(HRegionServer.java:3079)
>         at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:27022)
>         at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:1979)
>         at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:90)
>         at org.apache.hadoop.hbase.ipc.SimpleRpcScheduler.consumerLoop(SimpleRpcScheduler.java:160)
>         at org.apache.hadoop.hbase.ipc.SimpleRpcScheduler.access$000(SimpleRpcScheduler.java:38)
>         at org.apache.hadoop.hbase.ipc.SimpleRpcScheduler$1.run(SimpleRpcScheduler.java:110)
>         at java.lang.Thread.run(Thread.java:724)
> 2013-10-22 10:58:43,665 ERROR [RpcServer.handler=23,port=36020] regionserver.HRegionServer:
> org.apache.hadoop.hbase.exceptions.OutOfOrderScannerNextException: Expected nextCallSeq:
53438 But the nextCallSeq got from client: 53437; request=scanner_id: 1252577470624375060
number_of_rows: 100 close_scanner: false next_call_seq: 53437
>         at org.apache.hadoop.hbase.regionserver.HRegionServer.scan(HRegionServer.java:3030)
>         at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:27022)
>         at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:1979)
>         at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:90)
>         at org.apache.hadoop.hbase.ipc.SimpleRpcScheduler.consumerLoop(SimpleRpcScheduler.java:160)
>         at org.apache.hadoop.hbase.ipc.SimpleRpcScheduler.access$000(SimpleRpcScheduler.java:38)
>         at org.apache.hadoop.hbase.ipc.SimpleRpcScheduler$1.run(SimpleRpcScheduler.java:110)
>         at java.lang.Thread.run(Thread.java:724)
> {noformat}



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